101 Basic Series - Module 22 - CEU Education
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1
The smallest units in an MCC measure 6" high and can increase in size by 6" up to 72".
2
________ wiring means there are no terminal blocks in the unit and control and load connections are made directly to the devices.
3
________ wiring means that there are terminal blocks within each unit, and the devices are factory wired to them.
4
Pull-apart terminal blocks are mounted such that they have access to the vertical wireway, and if a unit is pulled for maintenance, the wiring can remain within the center.
5
IEC and NEMA have set standards for the protection of devices in various environmental situations.
6
The units in an MCC can contain starters, circuit breakers, disconnect switches, drives, PLC's, operator interface panels, and device communication products.
7
NEMA assigns IP classifications for enclosures, while IEC uses a Type system.
8
An enclosure rating that is used indoors where unusual conditions do not exist, are made of sheet steel, and depending on size may have knockouts for electrical cabling, would be.
9
An enclosure rating that is designed for outdoor use, made of sheet steel, have a gasket on the cover, and may have a blank cover plate attached to the top and most have knockouts on the bottom.
10
While the depth of an MCC can vary from 16" to 21", a typical MCC section is which of the following:
11
Multi-Pak group control can have 4 or 6 starters mounted in NEMA sizes 1 through 4 enclosures.
12
The main components of enclosed control include the following, EXCEPT:
13
NEMA establishes local electric codes that determine the proper selection of an enclosure type.
14
The vertical wireway in an MCC is located on the ________ of each section and extends the full height.
15
A typical custom panel has a fault current rating of 15,000 amps, much higher than that of an MCC.
16
These attach plug-in units to the MCC power bus bars.
17
Combination starters can have fusible or non-fusible disconnects.
18
The ________  horizontal wireways are isolated from the main horizontal bus that runs through each section of the structure.
19
A column section in an MCC assembly is also referred to as a ________.
20
In an MCC, a motor control compartment is often referred to as a ________.